Just came here to say I am having a similar flipper issue on my TAF but this is the first time I am seeing this issue after owning this pin for a few years.
Bottom right flipper falls down intermittently when holding in the flipper button. While holding the button in, sometimes the bottom flipper falls. Sometimes it stays down, sometimes it re-engages and flips back up. My guess is its a problem with the flipper switch but not sure how to troubleshoot it. Sorry to hijack the thread but wondering if its the same issue.